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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: so sánh :2021×2021 với 2020×2022

Toán Lớp 6: so sánh :2021×2021 với 2020×2022

Comments ( 2 )

  1. Giải đáp:
     2021.2021 > 2020.2022
    Lời giải và giải thích chi tiết:
     Ta có:
    2021.2021=2021.(2020+1)=2021.2020 + 2021
    2020.2022=2020.(2021+1)=2021.2020 + 2021
    Do 2021 > 2020 => 2021.2020 + 2021 > 2021.2020 + 2021
    <=> 2021.2021 > 2020.2022

  2. Ta có : 2021 xx 2021 = ( 2022 – 1 ) xx 2021 = 2022 xx 2021 – 2021
               2020 xx 2022 = ( 2021 – 1 ) xx 2022 = 2021 xx 2022 – 2022
    Mà 2022 > 2021 nên 2022 xx 2021 – 2021 > 2021 xx 2022 – 2022 hay 2021 xx 2021 > 2020 xx 2022
    Vậy , 2021 xx 2021 > 2020 xx 2022 .
     

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222-9+11+12:2*14+14 = ? ( )

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